a1bb46c36c
The _PPC change notifications from the platform firmware are per-CPU,
so acpi_processor_ppc_init() needs to add a frequency QoS request
for each CPU covered by a cpufreq policy to take all of them into
account.
Even though ACPI thermal control of CPUs sets frequency limits
per processor package, it also needs a frequency QoS request for each
CPU in a cpufreq policy in case some of them are taken offline and
the frequency limit needs to be set through the remaining online
ones (this is slightly excessive, because all CPUs covered by one
cpufreq policy will set the same frequency limit through their QoS
requests, but it is not incorrect).
Modify the code in accordance with the above observations.
Fixes: d15ce41273 ("ACPI: cpufreq: Switch to QoS requests instead of cpufreq notifier")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
268 lines
6 KiB
C
268 lines
6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* processor_thermal.c - Passive cooling submodule of the ACPI processor driver
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
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* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
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* - Added processor hotplug support
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/acpi.h>
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#include <acpi/processor.h>
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#include <linux/uaccess.h>
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#define PREFIX "ACPI: "
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#define ACPI_PROCESSOR_CLASS "processor"
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#define _COMPONENT ACPI_PROCESSOR_COMPONENT
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ACPI_MODULE_NAME("processor_thermal");
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#ifdef CONFIG_CPU_FREQ
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/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
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* offers (in most cases) voltage scaling in addition to frequency scaling, and
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* thus a cubic (instead of linear) reduction of energy. Also, we allow for
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* _any_ cpufreq driver and not only the acpi-cpufreq driver.
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*/
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#define CPUFREQ_THERMAL_MIN_STEP 0
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#define CPUFREQ_THERMAL_MAX_STEP 3
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static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg);
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#define reduction_pctg(cpu) \
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per_cpu(cpufreq_thermal_reduction_pctg, phys_package_first_cpu(cpu))
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/*
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* Emulate "per package data" using per cpu data (which should really be
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* provided elsewhere)
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*
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* Note we can lose a CPU on cpu hotunplug, in this case we forget the state
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* temporarily. Fortunately that's not a big issue here (I hope)
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*/
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static int phys_package_first_cpu(int cpu)
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{
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int i;
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int id = topology_physical_package_id(cpu);
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for_each_online_cpu(i)
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if (topology_physical_package_id(i) == id)
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return i;
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return 0;
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}
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static int cpu_has_cpufreq(unsigned int cpu)
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{
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struct cpufreq_policy policy;
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if (!acpi_processor_cpufreq_init || cpufreq_get_policy(&policy, cpu))
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return 0;
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return 1;
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}
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static int cpufreq_get_max_state(unsigned int cpu)
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{
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if (!cpu_has_cpufreq(cpu))
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return 0;
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return CPUFREQ_THERMAL_MAX_STEP;
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}
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static int cpufreq_get_cur_state(unsigned int cpu)
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{
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if (!cpu_has_cpufreq(cpu))
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return 0;
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return reduction_pctg(cpu);
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}
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static int cpufreq_set_cur_state(unsigned int cpu, int state)
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{
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struct cpufreq_policy *policy;
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struct acpi_processor *pr;
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unsigned long max_freq;
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int i, ret;
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if (!cpu_has_cpufreq(cpu))
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return 0;
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reduction_pctg(cpu) = state;
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/*
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* Update all the CPUs in the same package because they all
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* contribute to the temperature and often share the same
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* frequency.
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*/
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for_each_online_cpu(i) {
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if (topology_physical_package_id(i) !=
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topology_physical_package_id(cpu))
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continue;
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pr = per_cpu(processors, i);
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if (unlikely(!freq_qos_request_active(&pr->thermal_req)))
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continue;
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policy = cpufreq_cpu_get(i);
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if (!policy)
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return -EINVAL;
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max_freq = (policy->cpuinfo.max_freq * (100 - reduction_pctg(i) * 20)) / 100;
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cpufreq_cpu_put(policy);
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ret = freq_qos_update_request(&pr->thermal_req, max_freq);
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if (ret < 0) {
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pr_warn("Failed to update thermal freq constraint: CPU%d (%d)\n",
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pr->id, ret);
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}
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}
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return 0;
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}
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void acpi_thermal_cpufreq_init(struct cpufreq_policy *policy)
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{
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unsigned int cpu;
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for_each_cpu(cpu, policy->related_cpus) {
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struct acpi_processor *pr = per_cpu(processors, cpu);
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int ret;
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if (!pr)
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continue;
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ret = freq_qos_add_request(&policy->constraints,
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&pr->thermal_req,
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FREQ_QOS_MAX, INT_MAX);
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if (ret < 0)
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pr_err("Failed to add freq constraint for CPU%d (%d)\n",
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cpu, ret);
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}
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}
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void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
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{
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unsigned int cpu;
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for_each_cpu(cpu, policy->related_cpus) {
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struct acpi_processor *pr = per_cpu(processors, policy->cpu);
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if (pr)
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freq_qos_remove_request(&pr->thermal_req);
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}
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}
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#else /* ! CONFIG_CPU_FREQ */
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static int cpufreq_get_max_state(unsigned int cpu)
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{
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return 0;
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}
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static int cpufreq_get_cur_state(unsigned int cpu)
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{
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return 0;
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}
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static int cpufreq_set_cur_state(unsigned int cpu, int state)
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{
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return 0;
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}
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#endif
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/* thermal cooling device callbacks */
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static int acpi_processor_max_state(struct acpi_processor *pr)
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{
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int max_state = 0;
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/*
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* There exists four states according to
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* cpufreq_thermal_reduction_pctg. 0, 1, 2, 3
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*/
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max_state += cpufreq_get_max_state(pr->id);
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if (pr->flags.throttling)
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max_state += (pr->throttling.state_count -1);
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return max_state;
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}
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static int
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processor_get_max_state(struct thermal_cooling_device *cdev,
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unsigned long *state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_processor *pr;
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if (!device)
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return -EINVAL;
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pr = acpi_driver_data(device);
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if (!pr)
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return -EINVAL;
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*state = acpi_processor_max_state(pr);
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return 0;
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}
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static int
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processor_get_cur_state(struct thermal_cooling_device *cdev,
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unsigned long *cur_state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_processor *pr;
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if (!device)
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return -EINVAL;
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pr = acpi_driver_data(device);
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if (!pr)
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return -EINVAL;
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*cur_state = cpufreq_get_cur_state(pr->id);
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if (pr->flags.throttling)
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*cur_state += pr->throttling.state;
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return 0;
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}
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static int
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processor_set_cur_state(struct thermal_cooling_device *cdev,
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unsigned long state)
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{
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struct acpi_device *device = cdev->devdata;
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struct acpi_processor *pr;
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int result = 0;
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int max_pstate;
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if (!device)
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return -EINVAL;
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pr = acpi_driver_data(device);
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if (!pr)
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return -EINVAL;
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max_pstate = cpufreq_get_max_state(pr->id);
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if (state > acpi_processor_max_state(pr))
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return -EINVAL;
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if (state <= max_pstate) {
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if (pr->flags.throttling && pr->throttling.state)
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result = acpi_processor_set_throttling(pr, 0, false);
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cpufreq_set_cur_state(pr->id, state);
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} else {
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cpufreq_set_cur_state(pr->id, max_pstate);
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result = acpi_processor_set_throttling(pr,
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state - max_pstate, false);
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}
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return result;
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}
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const struct thermal_cooling_device_ops processor_cooling_ops = {
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.get_max_state = processor_get_max_state,
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.get_cur_state = processor_get_cur_state,
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.set_cur_state = processor_set_cur_state,
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};
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